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Erika Peterson
Mathematics
24 April, 06:46
If cos45⁰=0.707 find cos (-45⁰)
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Broderick Schmidt
24 April, 06:56
0
0.707
Step-by-step explanation:
cos in the 4th quadrant is positive as well as in 1st quadrant.
cos (-45°) is in the 4th quadrant.
So cos40° must equal cos (-45°) which is 0.707.
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